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Ingredient file // Animal protein

Mackerel

Real fish protein with an uncertain omega payoff

Mackerel is an oily fish used in dog food for protein and marine fat. It contains EPA and DHA, but its place on an ingredient list cannot tell you how much of either reaches your dog's bowl.

What it is
Mackerel fish or flesh added to dog food as a source of protein and marine fat.
Made from
Mackerel caught at sea
Main job
Fish protein and fat
Typical amount
Not published
Watch for
Species matters for mercury
Not the same as
Mackerel meal

Straight answer

Is Mackerel safe for dogs?

Check the species and finished food

Mackerel is a useful source of fish protein and fat, but a high place on the list reflects its weight before cooking. Check the other proteins and oils around it. For an omega-3 claim, ask for EPA and DHA amounts in the finished food. For mercury, ask which mackerel species is used.

Why it is in the food
Fish protein and fat

Our read // In our catalog

In 1 of every 200 foods we track

Share of foods that list it

<1%

16 of the 3,204 foods with an ingredient list on file, from 7 brands. 8 wet dog food, 4 dog food topper, 3 dry dog food.

Each square is 1% of the catalog

Where it sits on the label

Median position 3. In the top five of 12 foods, so it is usually a main ingredient.

Top five List position, heaviest first

Above the salt

100%

Almost always listed before the salt, so there is more of it than a pinch.

Price per lb

Foods with it $4.55
All foods $3.25

Median of the cheapest bag price across 5 priced foods, 40% above the catalog. The price is the food's, not the ingredient's.

Who leans on it

31%

of the foods that list it are from Weruva. 7 brands use it in total.

What it is

How it is made

Fishing fleets catch schooling mackerel for several markets. Its oily flesh spoils quickly, so processors chill or freeze the catch before preparing it. Pet food makers receive fish cold and cook it in the recipe.6,9

  1. 01 // Source Caught mackerel Fleets catch schooling fish; the common name covers several species.
  2. 02 // Process Chilled or frozen The catch is cooled promptly because mackerel spoils quickly without temperature control.
  3. 03 // Process Prepared for use Processors supply whole fish or prepared flesh, depending on the product being made.
  4. 04 // Output Cold mackerel Fish arrives refrigerated or frozen for mixing and cooking with the other pet food ingredients.

What is in it

Composition, dry matter

42.7

% protein

Protein in ground Atlantic mackerel starting material from one processing study, taken in the fall fat-storage season. The same batch carried slightly more fat than protein.

Crude protein 42.7%4
Crude fat 45.2%4
Ash 5.6%4

These are figures for one Atlantic mackerel starting material, not a fixed recipe value. Species and season matter: mackerel builds up fat heavily before its fall migration, so the same fish tests leaner at other times of year.4

Why it is in the bag

What the manufacturer gets

  1. 01

    Adds animal protein

    Whole mackerel contributes protein and fat. In dry kibble, much of its water leaves during cooking, so its listed weight overstates its share of the finished food.4,9,10

  2. 02

    Supplies marine fats

    Mackerel flesh contains EPA and DHA. A maker can use it to supply those fats, but the ingredient list gives no amount in the finished food.5,10

  3. 03

    Caught in quantity by purse seine

    FAO names purse seining as the leading method for catching mackerel in quantity off the west of Scotland in late summer, supplying fleets with schooling fish for processing.6

How much One published commercial recipe lists 14% dehydrated mackerel; that figure does not describe a typical amount of fresh mackerel.11

Our read // The claims

What the evidence supports

Strong: controlled studies in dogs agree. Some: small or mixed dog data. Thin: mechanism or lab work only. None: nothing, or the evidence points the other way.

  1. Brands say

    Mackerel supplies protein and marine omega-3s

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    Ground Atlantic mackerel measured 42.7% protein on a dry basis, while cooked Atlantic mackerel flesh contains 1,203 mg EPA plus DHA per 100 g. Neither figure measures the finished dog food.4,5

  2. Brands say

    Mackerel makes skin and coats healthier

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    One 22-dog trial tested a fish oil product, not mackerel, alongside an allergy drug for 16 weeks. Coat score improved within the fish oil group but was not compared directly with the placebo group, and mackerel itself was not fed.1,11

  3. Owners say

    Mackerel relieves arthritic joint pain

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    A blinded trial assigned 77 dogs with osteoarthritis to fish oil or corn oil. After 16 weeks, its main pain measures showed no significant difference between groups. It did not test mackerel.2

  4. Owners say

    All mackerel is high in mercury

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    FDA puts Atlantic and Pacific chub mackerel among its lower mercury choices for people, but king mackerel in its highest mercury group. The species makes this blanket claim false.7

Straight answers

What owners ask

  1. Q01

    Is it just filler?

    No

    Whole mackerel supplies protein and fat. What the label cannot tell you is its final share of a dry food: fresh fish carries water that leaves during cooking.4,9,10

  2. Q02

    Does mackerel first mean most protein?

    Not necessarily

    Ingredients are listed by weight, and fresh mackerel includes substantial water. Its position tells you what went into the recipe by weight, not which ingredient supplies the most protein after cooking.4,10

  3. Q03

    Should I worry about mercury?

    Check the species

    FDA's human fish guidance places Atlantic and Pacific chub mackerel in a lower mercury group and king mackerel in its highest group. Ask the maker which species the food contains.7

Who uses it

Brands, best sellers and the company it keeps

Top brands, by foods that list it

  1. Weruva 5 / 50
  2. Nulo 4 / 117
  3. Stella & Chewy's 3 / 85
  4. Open Farm 1 / 42
  5. Dr. Marty 1 / 6
  6. ZIWI 1 / 11
  7. Orijen 1 / 25

Foods that list it / all the brand's recipes we track.

Usually listed with, share of the foods that list it

  1. Water Sufficient for Processing 38%
  2. Pumpkin 38%
  3. Lamb 38%
  4. Sunflower Seed Oil 31%
  5. Locust Bean Gum 31%
  6. Salmon 31%
  7. Sunflower Oil 25%
  8. Lamb Liver 25%
  9. Chicken 25%
  10. Xanthan Gum 25%
  11. Mackerel Broth 25%
  12. Sweet Potatoes 19%

On the shelf

Foods that list Mackerel

16 foods in our catalog list it, highest on the label first.

ZIWI /Mackerel And Lamb Grain-Free Wet Dog FoodZIWIZIWI /Mackerel And Lamb Grain-Free Wet Dog FoodWet // No. 1 on the labelWeruva Dogs in the Kitchen Classic Dog Marbella Paella with Mackerel & Pumpkin Grain-Free Wet Dog FoodWeruvaWeruva Dogs in the Kitchen Classic Dog Marbella Paella with Mackerel & Pumpkin Grain-Free Wet Dog FoodWet // No. 1 on the labelNulo FreeStyle Meaty Pouches Mackerel, Chicken & Mussel Recipe Grain-Free Dog Food TopperNuloNulo FreeStyle Meaty Pouches Mackerel, Chicken & Mussel Recipe Grain-Free Dog Food TopperTopper // No. 1 on the labelOpen Farm Herring & Mackerel Rustic Stew Dog Food TopperOpen FarmOpen Farm Herring & Mackerel Rustic Stew Dog Food TopperTopper // No. 3 on the labelWeruva Dogs in the Kitchen Lamburgini Wet Dog FoodWeruvaWeruva Dogs in the Kitchen Lamburgini Wet Dog FoodWet // No. 3 on the labelNulo MedalSeries Meaty Pouches Lamb, Mackerel & Kelp Recipe Grain-Free Dog Food TopperNuloNulo MedalSeries Meaty Pouches Lamb, Mackerel & Kelp Recipe Grain-Free Dog Food TopperTopper // No. 3 on the labelNulo FreeStyle Meaty Pouches Lamb, Mackerel & Kelp Recipe Grain-Free Dog Food TopperNuloNulo FreeStyle Meaty Pouches Lamb, Mackerel & Kelp Recipe Grain-Free Dog Food TopperTopper // No. 3 on the labelDr. Marty Nature’s Blend Premium Origin Freeze-Dried Dog FoodDr. MartyDr. Marty Nature’s Blend Premium Origin Freeze-Dried Dog FoodFreeze-Dried // No. 4 on the labelNulo Savory Stews Ancient Grains Chicken & Mackerel Recipe Wet Dog FoodNuloNulo Savory Stews Ancient Grains Chicken & Mackerel Recipe Wet Dog FoodWet // No. 4 on the labelStella & Chewy’s Wild-Caught Whitefish Raw Coated Kibble Grain-Free Dry Dog FoodStella & Chewy'sStella & Chewy’s Wild-Caught Whitefish Raw Coated Kibble Grain-Free Dry Dog FoodDry // No. 7 on the labelOrijen Original Stew Recipe with Chicken, Turkey & Eggs Wet Dog FoodOrijenOrijen Original Stew Recipe with Chicken, Turkey & Eggs Wet Dog FoodWet // No. 12 on the labelStella & Chewy’s Wild Red : Whole Prey Ocean Fish Recipe, Raw Coated Kibble - Protein Rich Poultry Free with Grain Dry Dog FoodStella & Chewy'sStella & Chewy’s Wild Red : Whole Prey Ocean Fish Recipe, Raw Coated Kibble - Protein Rich Poultry Free with Grain Dry Dog FoodDry // No. 13 on the label
Show 4 more
Weruva Dogs in the Kitchen Classic Dog Hot Dayam with Lamb in Gelée Wet Dog FoodWeruvaWeruva Dogs in the Kitchen Classic Dog Hot Dayam with Lamb in Gelée Wet Dog FoodWet // No. 3 on the labelWeruva Dogs in the Kitchen Goldie Lox Wet Dog FoodWeruvaWeruva Dogs in the Kitchen Goldie Lox Wet Dog FoodWet // No. 3 on the labelWeruva Dogs in the Kitchen The Double Dip Wet Dog FoodWeruvaWeruva Dogs in the Kitchen The Double Dip Wet Dog FoodWet // No. 5 on the labelStella & Chewy’s Wild Red Grain Free : Whole Prey Ocean Fish Recipe, Raw Coated Dry Dog FoodStella & Chewy'sStella & Chewy’s Wild Red Grain Free : Whole Prey Ocean Fish Recipe, Raw Coated Dry Dog FoodDry // No. 13 on the label

Sources

What we read

Checked October 1, 2026.

  1. 1 A placebo-controlled, double-blind study evaluating the effect of orally administered polyunsaturated fatty acids on the oclacitinib dose for atopic dogs Veterinary Dermatology, 2024 // Journal
  2. 2 An un-commissioned randomized, placebo-controlled double-blind study to test the effect of deep sea fish oil as a pain reliever for dogs suffering from canine OA BMC Veterinary Research, 2012 // Journal
  3. 3 Critically appraised topic on adverse food reactions of companion animals (2): common food allergen sources in dogs and cats BMC Veterinary Research, 2016 // Journal
  4. 4 Proteolytic processing of Atlantic mackerel (Scomber scombrus) and biochemical characterisation of hydrolysates International Journal of Food Science and Technology, 2009 // Journal
  5. 5 n-3 Fatty Acid Content of Fish Endotext, NCBI Bookshelf, n.d. // Book
  6. 6 Handling and Processing Mackerel Food and Agriculture Organization of the United Nations, n.d. // Government
  7. 7 Advice about Eating Fish U.S. Food and Drug Administration, 2021 // Government
  8. 8 Scombrotoxin Poisoning and Decomposition U.S. Food and Drug Administration, n.d. // Government
  9. 9 How Pet Food Is Made Pet Food Institute, n.d. // Industry
  10. 10 Reading Labels AAFCO, n.d. // Regulator
  11. 11 Adult Trout & Mackerel with Herring Riverwood Pet Food, n.d. // Industry
An ingredient on its own tells you very little. What matters is how much of it there is and where it sits in the list. That is why we weigh the top five rather than reacting to any single name further down. Back to the wiki

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